content: package net.minecraft.server;
  
  import java.util.Iterator;
  // CraftBukkit start
  import java.util.List;
  
  import org.bukkit.craftbukkit.inventory.CraftItemStack;
  import org.bukkit.entity.HumanEntity;
  import org.bukkit.event.inventory.FurnaceBurnEvent;
  import org.bukkit.event.inventory.FurnaceSmeltEvent;
  import org.bukkit.craftbukkit.entity.CraftHumanEntity;
  // CraftBukkit end
  
  public class TileEntityFurnace extends TileEntityContainer implements ITickable, IWorldInventory {
  
      private static final int[] a = new int[] { 0};
      private static final int[] f = new int[] { 2, 1};
      private static final int[] g = new int[] { 1};
      private NonNullList<ItemStack> items;
      private int burnTime;
      private int ticksForCurrentFuel;
      private int cookTime;
      private int cookTimeTotal;
      private String m;
  
      // CraftBukkit start - add fields and methods
      private int lastTick = MinecraftServer.currentTick;
      private int maxStack = MAX_STACK;
      public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
  
      public List<ItemStack> getContents() {
          return this.items;
      }
  
      public void onOpen(CraftHumanEntity who) {
          transaction.add(who);
      }
  
      public void onClose(CraftHumanEntity who) {
          transaction.remove(who);
      }
  
      public List<HumanEntity> getViewers() {
          return transaction;
      }
  
      public void setMaxStackSize(int size) {
          maxStack = size;
      }
      // CraftBukkit end
  
      public TileEntityFurnace() {
          this.items = NonNullList.a(3, ItemStack.a);
      }
  
      public int getSize() {
          return this.items.size();
      }
  
      public boolean x_() {
          Iterator iterator = this.items.iterator();
  
          ItemStack itemstack;
  
          do {
              if (!iterator.hasNext()) {
                  return true;
              }
  
              itemstack = (ItemStack) iterator.next();
          } while (itemstack.isEmpty());
  
          return false;
      }
  
      public ItemStack getItem(int i) {
          return (ItemStack) this.items.get(i);
      }
  
      public ItemStack splitStack(int i, int j) {
          return ContainerUtil.a(this.items, i, j);
      }
  
      public ItemStack splitWithoutUpdate(int i) {
          return ContainerUtil.a(this.items, i);
      }
  
      public void setItem(int i, ItemStack itemstack) {
          ItemStack itemstack1 = (ItemStack) this.items.get(i);
          boolean flag = !itemstack.isEmpty() && itemstack.doMaterialsMatch(itemstack1) && ItemStack.equals(itemstack, itemstack1);
  
          this.items.set(i, itemstack);
          if (itemstack.getCount() > this.getMaxStackSize()) {
              itemstack.setCount(this.getMaxStackSize());
          }
  
          if (i == 0 && !flag) {
              this.cookTimeTotal = this.a(itemstack);
              this.cookTime = 0;
              this.update();
          }
  
      }
  
      public String getName() {
          return this.hasCustomName() ? this.m : "container.furnace";
      }
  
      public boolean hasCustomName() {
          return this.m != null && !this.m.isEmpty();
      }
  
      public void setCustomName(String s) {
          this.m = s;
      }
  
      public static void a(DataConverterManager dataconvertermanager) {
          dataconvertermanager.a(DataConverterTypes.BLOCK_ENTITY, (DataInspector) (new DataInspectorItemList(TileEntityFurnace.class, new String[] { "Items"})));
      }
  
      public void load(NBTTagCompound nbttagcompound) {
          super.load(nbttagcompound);
          this.items = NonNullList.a(this.getSize(), ItemStack.a);
          ContainerUtil.b(nbttagcompound, this.items);
          this.burnTime = nbttagcompound.getShort("BurnTime");
          this.cookTime = nbttagcompound.getShort("CookTime");
          this.cookTimeTotal = nbttagcompound.getShort("CookTimeTotal");
          this.ticksForCurrentFuel = fuelTime((ItemStack) this.items.get(1));
          if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
              this.m = nbttagcompound.getString("CustomName");
          }
  
      }
  
      public NBTTagCompound save(NBTTagCompound nbttagcompound) {
          super.save(nbttagcompound);
          nbttagcompound.setShort("BurnTime", (short) this.burnTime);
          nbttagcompound.setShort("CookTime", (short) this.cookTime);
          nbttagcompound.setShort("CookTimeTotal", (short) this.cookTimeTotal);
          ContainerUtil.a(nbttagcompound, this.items);
          if (this.hasCustomName()) {
              nbttagcompound.setString("CustomName", this.m);
          }
  
          return nbttagcompound;
      }
  
      public int getMaxStackSize() {
          return 64;
      }
  
      public boolean isBurning() {
          return this.burnTime > 0;
      }
  
      public void e() {
          boolean flag = (this.getBlock() == Blocks.LIT_FURNACE); // CraftBukkit - SPIGOT-844 - Check if furnace block is lit using the block instead of burn time
          boolean flag1 = false;
  
          // CraftBukkit start - Use wall time instead of ticks for cooking
          int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
          this.lastTick = MinecraftServer.currentTick;
  
          // CraftBukkit - moved from below - edited for wall time
          if (this.isBurning() && this.canBurn()) {
              this.cookTime += elapsedTicks;
              if (this.cookTime >= this.cookTimeTotal) {
                  this.cookTime -= this.cookTimeTotal; // Paper
                  this.cookTimeTotal = this.a((ItemStack) this.items.get(0));
                  this.burn();
                  flag1 = true;
              }
          } else {
              this.cookTime = 0;
          }
          // CraftBukkit end
  
          if (this.isBurning()) {
              this.burnTime -= elapsedTicks; // CraftBukkit - use elapsedTicks in place of constant
          }
  
          if (!this.world.isClientSide) {
              ItemStack itemstack = (ItemStack) this.items.get(1);
  
              if (!this.isBurning() && (itemstack.isEmpty() || ((ItemStack) this.items.get(0)).isEmpty())) {
                  if (!this.isBurning() && this.cookTime > 0) {
                      this.cookTime = MathHelper.clamp(this.cookTime - 2, 0, this.cookTimeTotal);
                  }
              } else if(this.items.get(1) != null && this.items.get(1).getItem() != Items.BUCKET) {
                  // CraftBukkit start - Handle multiple elapsed ticks
                  if (this.burnTime <= 0 && this.canBurn()) { // CraftBukkit - == to <=
                      CraftItemStack fuel = CraftItemStack.asCraftMirror(itemstack);
  
                      FurnaceBurnEvent furnaceBurnEvent = new FurnaceBurnEvent(this.world.getWorld().getBlockAt(position.getX(), position.getY(), position.getZ()), fuel, fuelTime(itemstack));
                      this.world.getServer().getPluginManager().callEvent(furnaceBurnEvent);
  
                      if (furnaceBurnEvent.isCancelled()) {
                          return;
                      }
  
                      this.ticksForCurrentFuel = furnaceBurnEvent.getBurnTime();
                      this.burnTime += this.ticksForCurrentFuel;
                      if (this.burnTime > 0 && furnaceBurnEvent.isBurning()) {
                          // CraftBukkit end
                          flag1 = true;
                          if (!itemstack.isEmpty()) {
                              Item item = itemstack.getItem();
  
                              itemstack.subtract(1);
                              if (itemstack.isEmpty()) {
                                  Item item1 = item.q();
  
                                  this.items.set(1, item1 == null ? ItemStack.a : new ItemStack(item1));
                              }
                          }
                      }
                  }
  
                  /* CraftBukkit start - Moved up
                  if (this.isBurning() && this.canBurn()) {
                      ++this.cookTime;
                      if (this.cookTime == this.cookTimeTotal) {
                          this.cookTime = 0;
                          this.cookTimeTotal = this.a((ItemStack) this.items.get(0));
                          this.burn();
                          flag1 = true;
                      }
                  } else {
                      this.cookTime = 0;
                  }
                  */
              }
  
              if (flag != this.isBurning()) {
                  flag1 = true;
                  BlockFurnace.a(this.isBurning(), this.world, this.position);
                  this.invalidateBlockCache(); // CraftBukkit - Invalidate tile entity's cached block type 
              }
          }
  
          if (flag1) {
              this.update();
          }
  
      }
  
      public int a(ItemStack itemstack) {
          return 200;
      }
  
      private boolean canBurn() {
          if (((ItemStack) this.items.get(0)).isEmpty()) {
              return false;
          } else {
              ItemStack itemstack = RecipesFurnace.getInstance().getResult((ItemStack) this.items.get(0));
  
              if (itemstack.isEmpty()) {
                  return false;
              } else {
                  ItemStack itemstack1 = (ItemStack) this.items.get(2);
  
                  // CraftBukkit - consider resultant count instead of current count
                  return itemstack1.isEmpty() ? true : (!itemstack1.doMaterialsMatch(itemstack) ? false : (itemstack1.getCount() + itemstack.getCount() <= this.getMaxStackSize() && itemstack1.getCount() + itemstack.getCount() < itemstack1.getMaxStackSize() ? true : itemstack1.getCount() + itemstack.getCount() <= itemstack.getMaxStackSize()));
              }
          }
      }
  
      public void burn() {
          if (this.canBurn()) {
              ItemStack itemstack = (ItemStack) this.items.get(0);
              ItemStack itemstack1 = RecipesFurnace.getInstance().getResult(itemstack);
              ItemStack itemstack2 = (ItemStack) this.items.get(2);
  
              // CraftBukkit start - fire FurnaceSmeltEvent
              CraftItemStack source = CraftItemStack.asCraftMirror(itemstack);
              org.bukkit.inventory.ItemStack result = CraftItemStack.asBukkitCopy(itemstack1);
  
              FurnaceSmeltEvent furnaceSmeltEvent = new FurnaceSmeltEvent(this.world.getWorld().getBlockAt(position.getX(), position.getY(), position.getZ()), source, result);
              this.world.getServer().getPluginManager().callEvent(furnaceSmeltEvent);
  
              if (furnaceSmeltEvent.isCancelled()) {
                  return;
              }
  
              result = furnaceSmeltEvent.getResult();
              itemstack1 = CraftItemStack.asNMSCopy(result);
  
              if (!itemstack1.isEmpty()) {
                  if (itemstack2.isEmpty()) {
                      this.items.set(2, itemstack1.cloneItemStack());
                  } else if (CraftItemStack.asCraftMirror(itemstack2).isSimilar(result)) {
                      itemstack2.add(itemstack1.getCount());
                  } else {
                      return;
                  }
              }
  
              /*
              if (itemstack2.isEmpty()) {
                  this.items.set(2, itemstack1.cloneItemStack());
              } else if (itemstack2.getItem() == itemstack1.getItem()) {
                  itemstack2.add(1);
              }
              */
              // CraftBukkit end
  
              if (itemstack.getItem() == Item.getItemOf(Blocks.SPONGE) && itemstack.getData() == 1 && !((ItemStack) this.items.get(1)).isEmpty() && ((ItemStack) this.items.get(1)).getItem() == Items.BUCKET) {
                  this.items.set(1, new ItemStack(Items.WATER_BUCKET));
              }
  
              itemstack.subtract(1);
          }
      }
  
      public static int fuelTime(ItemStack itemstack) {
          if (itemstack.isEmpty()) {
              return 0;
          } else {
              Item item = itemstack.getItem();
  
              return item == Item.getItemOf(Blocks.WOODEN_SLAB) ? 150 : (item == Item.getItemOf(Blocks.WOOL) ? 100 : (item == Item.getItemOf(Blocks.CARPET) ? 67 : (item == Item.getItemOf(Blocks.LADDER) ? 300 : (item == Item.getItemOf(Blocks.WOODEN_BUTTON) ? 100 : (Block.asBlock(item).getBlockData().getMaterial() == Material.WOOD ? 300 : (item == Item.getItemOf(Blocks.COAL_BLOCK) ? 16000 : (item instanceof ItemTool && "WOOD".equals(((ItemTool) item).h()) ? 200 : (item instanceof ItemSword && "WOOD".equals(((ItemSword) item).h()) ? 200 : (item instanceof ItemHoe && "WOOD".equals(((ItemHoe) item).g()) ? 200 : (item == Items.STICK ? 100 : (item != Items.BOW && item != Items.FISHING_ROD ? (item == Items.SIGN ? 200 : (item == Items.COAL ? 1600 : (item == Items.LAVA_BUCKET ? 20000 : (item != Item.getItemOf(Blocks.SAPLING) && item != Items.BOWL ? (item == Items.BLAZE_ROD ? 2400 : (item instanceof ItemDoor && item != Items.IRON_DOOR ? 200 : (item instanceof ItemBoat ? 400 : 0))) : 100)))) : 300)))))))))));
          }
      }
  
      public static boolean isFuel(ItemStack itemstack) {
          return fuelTime(itemstack) > 0;
      }
  
      public boolean a(EntityHuman entityhuman) {
          return this.world.getTileEntity(this.position) != this ? false : entityhuman.d((double) this.position.getX() + 0.5D, (double) this.position.getY() + 0.5D, (double) this.position.getZ() + 0.5D) <= 64.0D;
      }
  
      public void startOpen(EntityHuman entityhuman) {}
  
      public void closeContainer(EntityHuman entityhuman) {}
  
      public boolean b(int i, ItemStack itemstack) {
          if (i == 2) {
              return false;
          } else if (i != 1) {
              return true;
          } else {
              ItemStack itemstack1 = (ItemStack) this.items.get(1);
  
              return isFuel(itemstack) || SlotFurnaceFuel.d_(itemstack) && itemstack1.getItem() != Items.BUCKET;
          }
      }
  
      public int[] getSlotsForFace(EnumDirection enumdirection) {
          return enumdirection == EnumDirection.DOWN ? TileEntityFurnace.f : (enumdirection == EnumDirection.UP ? TileEntityFurnace.a : TileEntityFurnace.g);
      }
  
      public boolean canPlaceItemThroughFace(int i, ItemStack itemstack, EnumDirection enumdirection) {
          return this.b(i, itemstack);
      }
  
      public boolean canTakeItemThroughFace(int i, ItemStack itemstack, EnumDirection enumdirection) {
          if (enumdirection == EnumDirection.DOWN && i == 1) {
              Item item = itemstack.getItem();
  
              if (item != Items.WATER_BUCKET && item != Items.BUCKET) {
                  return false;
              }
          }
  
          return true;
      }
  
      public String getContainerName() {
          return "minecraft:furnace";
      }
  
      public Container createContainer(PlayerInventory playerinventory, EntityHuman entityhuman) {
          return new ContainerFurnace(playerinventory, this);
      }
  
      public int getProperty(int i) {
          switch (i) {
          case 0:
              return this.burnTime;
  
          case 1:
              return this.ticksForCurrentFuel;
  
          case 2:
              return this.cookTime;
  
          case 3:
              return this.cookTimeTotal;
  
          default:
              return 0;
          }
      }
  
      public void setProperty(int i, int j) {
          switch (i) {
          case 0:
              this.burnTime = j;
              break;
  
          case 1:
              this.ticksForCurrentFuel = j;
              break;
  
          case 2:
              this.cookTime = j;
              break;
  
          case 3:
              this.cookTimeTotal = j;
          }
  
      }
  
      public int h() {
          return 4;
      }
  
      public void clear() {
          this.items.clear();
      }
  }
  